acerbation vs ire

acerbation

noun

  • Bitterness of feeling. 

  • Exacerbation, aggravation, deterioration. 

ire

noun

  • Great anger; wrath; keen resentment. 

verb

  • To anger, to irritate. 

How often have the words acerbation and ire occurred in a corpus of books? (source: Google Ngram Viewer )